engleski

Effect of cultivar and geographical region on quality parameters of fresh juices from sour cherry and Marasca sour cherry

Sour cherry Marasca (Prunus cerasus var. marasca) is particularly valuable fruit species from Dalmatian region (Croatia) that differs from other sour cherries with smaller fruit, higher dry matter content, pronounced flavor, darker colour and higher bioactive compounds content. Sour cherries can be processed into fresh juice but cultivar differences and growing area may affect on their quality. Therefore, the aim of this study was to investigate the effect of cultivar and geographical region on quality parameters of sour cherry and Marasca sour cherry fresh juices. Sour cherries were harvested in 2011 and kept at -18 0C till juice production. Juice was produced in juice extractor. 14 juices were produced from 7 cultivars/ecotypes grown in two different regions (Osijek and Zadar). In all samples soluble dry matter, pH value and total acidity were determined. Colour parameters were measured with colorimetric CIELAB method. All results were statistically analyzed using ANOVA. Influence of growing in Zadar was greater on soluble dry matter of Marasca ecotypes than the others cultivars. The slightest influence of growing area was on soluble dry matter of Rexelle, Heimann and Kelleris. However, soluble dry matter of all cultivars were significantly higher in Zadar than in Osijek. Maraska had the highest soluble dry matter content (23.05-31.00%) and the highest total acidity (1.76-2.44%) in both areas. In all Zadar samples pH value was higher and total acidity was significantly lower than in Osijek. Cultivar or growing area did not have significant influence on colour parameters. Maraska from Zadar has the highest content of soluble dry matter and lowest pH value, but Maraska from Osijek has the highest total acidity. Though there is no statistical significance, Zadar cultivars mostly have a darker colour where Maraska is the darkest one.

sour cherry; juice; quality; colour

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